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06 March 2002 AGE-NC Project No. 99-0641 Page 4 of 6 3.5. GROUND WATER SAMPLING One grab ground water sample was collected from probe boring SB-1 using a Geoprobe hydropunch sampling assembly. The probe rods were advanced to 30 feet bsg. The hollow steel rods were then pulled up four feet exposing a PVC screen in the saturated zones. Ground water was allowed to enter the screen, and samples were retrieved using a modified PVC tubing bailer. Sufficient sample was collected from the borings to fill three 40-m1 EPA-approved volatile organic analysis (VOA) vials containing 0.5 ml 18%hydrochloric acid as a sample preservative. Ground water sample containers were labeled with probe boring designation,depth,date,time,and sampler's initials. The preserved samples was logged on a chain-of-custody form,placed in a chilled container and transported to MAI for analysis. 3.6. GROUND WATER ANALYSES The grab ground water sample was analyzed for volatile organic compounds including BTEX in accordance with EPA Method 8260M. 3.7. EQUIPMENT DECONTAMINATION Prior to sample collection, Geoprobe soil and ground water sampling equipment was thoroughly rinsed with clean water after washing with a solution of Alconox. Geoprobe rods were thoroughly cleaned prior to soil probe boring advancement. 4.0. FINDINGS Soil descriptions were utilized to construct the site geological model; laboratory analysis of soil and ground water samples were utilized to quantify the impact on soil and ground water. 4.1 SOIL PROFILE Road base was encountered from surface grade to approximately 7 feet bsg. Light brown to dark gray, damp, silty clay was encountered at 10 feet, 20 feet, 25 feet and 30 feet bsg. Reddish brown, damp, sandy silt was encountered at 15 feet bsg and light brown, damp, silty sand was encountered at 21 feet bsg. The boring log is included in Appendix A. Advanced GeoFuvironmcnlal,Inc.